fr.emn.reactiveinput.devices
Class DMinus

java.lang.Object
  fr.emn.reactiveinput.AbstractDevice
      fr.emn.reactiveinput.AbstractMutableDevice
          fr.emn.reactiveinput.devices.DMinus

All Implemented Interfaces:

Device, MutableDevice, Processor

public class DMinus

extends AbstractMutableDevice

A mutable double/int minus device.

Field Summary

In	in1
In	in2
Out	out

Fields inherited from class fr.emn.reactiveinput.AbstractDevice

currIndex, ins, outs

Fields inherited from interface fr.emn.reactiveinput.Device

AUTO_PROPERTIES

Constructor Summary

DMinus()

Method Summary

Slot[]	getMutationTriggers() Returns the mutation triggers for this mutable device, i.e. all input or output slots that trigger a mutation when it is connected to another type.
boolean	isOpenable() USE: Design.
void	mutate() Performs a mutation on this device.
Processor	open(OpenContext context) Ensures that the device will be ready for processing or producing data, and returns the Processor object that will process data, or null if an error occured.

Methods inherited from class fr.emn.reactiveinput.AbstractMutableDevice

addMutableIn, addMutableIn, addMutableIn, addMutableOut, addMutableOut, remove

Methods inherited from class fr.emn.reactiveinput.AbstractDevice

addIn, addIn, addOut, close, copy, doDisable, doEnable, finalize, getError, getIndex, getInfo, getIns, getName, getOuts, getProperties, hasExternalInput, hasExternalOutput, init, insertAt, insertAtEnd, insertBefore, isCopiable, isEnabled, setEnabled, setInfo, setInfo, setLastError, setName, update

Methods inherited from class java.lang.Object

clone, equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface fr.emn.reactiveinput.Device

close, copy, getError, getInfo, getIns, getName, getOuts, getProperties, hasExternalInput, hasExternalOutput, isCopiable, setEnabled

Field Detail

in1

public final In in1

in2

public final In in2

out

public final Out out

Constructor Detail

DMinus

public DMinus()

Method Detail

getMutationTriggers

public Slot[] getMutationTriggers()

Description copied from class: AbstractMutableDevice

Returns the mutation triggers for this mutable device, i.e. all input or output slots that trigger a mutation when it is connected to another type.

Specified by:

getMutationTriggers in interface MutableDevice

Specified by:

getMutationTriggers in class AbstractMutableDevice

isOpenable

public boolean isOpenable()

Description copied from interface: Device

USE: Design.

This method returns false if the device is not openable because it is not properly configured (e.g. important input slots are not connected). Reactive machines ignore devices that are not openable.

Use this method if you want some pre-conditions to be verified before the execution of your device, inside init() and update() methods.

In the default method provided in DeviceUtilities, isOpenable() returns false if one or several obligatory input slots are not valid (see In.isValid()). You may add your own pre-conditions to this method.

Example :

public boolean isOpenable() { if (DeviceUtilities.defaultIsOpenable(this)) { // Verify default pre-conditions if (...) // Put additional pre-conditions here return true; } return false; }

Specified by:

isOpenable in interface Device

Overrides:

isOpenable in class AbstractDevice

mutate

public void mutate()

Performs a mutation on this device. This method is called when a connection is made (or deleted) on a mutation trigger.

Specified by:

mutate in interface MutableDevice

Specified by:

mutate in class AbstractMutableDevice

open

public Processor open(OpenContext context)

Description copied from interface: Device

Ensures that the device will be ready for processing or producing data, and returns the Processor object that will process data, or null if an error occured.

Some devices may need to perform some more or less heavy initialization (such as allocating resources or opening a stream) before being able to process or produce data. This is the case for most input devices, and some I/O and output devices. All these initializations must be done in the open() method.

Because these initializations are subject to fail, open() may return null even if isOpenable() returns true. In all cases, returning a non-null Processor means that the device is now able to process or produce data.

RE-OPENING A DEVICE:

Devices always stay open during reconfiguration, in order to avoid unnecessary deallocation and reallocation of resources. However, some devices will need to be re-open before re-starting the configuration. So open() is always called on all devices before re-starting.

If open() is called on a device that is already open, it may have no effect (and the current Processor is returned), or the device may be re-open if something has changed in its configuration.

Using a Processor as a return value allows the use of different processors, each adapted to a specific device configuration.

Specified by:

open in interface Device

Overrides:

open in class AbstractDevice

See Also:

Processor, Device.open()